This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A262428 #89 Oct 11 2018 19:26:53
%S A262428 24,36,59,710,1114,1315,1721,1922,2325,2926,3133,3734,4135,4338,4739,
%T A262428 5346,5949,6151,6755,7157,7358,7962,8365,8969,9774,10177,10382,10785,
%U A262428 10986,11387,12791,13193,13794,13995,149106,151111,157115,163118,167119,173121,179122,181123,191129,193133,197134
%N A262428 Concatenate the n-th prime with the n-th semiprime.
%C A262428 Sequence is simply visual coexistence of two core and nice sequences. - _Altug Alkan_, Sep 28 2015
%t A262428 t = Select[Range@ 10000, PrimeOmega@ # == 2 &]; Table[FromDigits@ Join[IntegerDigits@ Prime@ n, IntegerDigits@ t[[n]]], {n, 50}] (* _Michael De Vlieger_, Sep 22 2015 *)
%o A262428 (PARI) m=0; for (n=1, 250, if (bigomega(n) == 2, m++; print1(Str(prime(m), n), ", "))) \\ _Altug Alkan_, Sep 23 2015
%o A262428 (Perl) use ntheory ":all"; my $i=0; forprimes { print ++$i," $_", nth_semiprime($i),"\n"; } 100; # _Dana Jacobsen_, Oct 11 2018
%Y A262428 Cf. A000040, A001358, A001097, A065870.
%K A262428 nonn,base,easy
%O A262428 1,1
%A A262428 _Giovanni Teofilatto_, Sep 22 2015